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8CIOPTICON MANUAL. 127 and now that transparencies are so readily multiplied by photography upon glass, upon mica, or gelatin, by the printing press or the pen, it is destined to find a place in every household; for in it are combined the attrac- tive qualities of beauty, amusement, and instruction. " The electric light affords probably the strongest and best illumination for the Magic Lantern; then comes the magnesium light; but their use is a little trouble- some and rather expensive; next to these in illuminating power is the oxy-hydrogen or Drummond light. The preparation of the gases and the use of the calcium points involve considerable skill. "Need has long been felt for some form of the Magic Lantern having a strong light, but more easily produced than any of those just mentioned; and this has at last been accomplished, after several years' study and experi- ment, by Professor L. J. Marcy. " The Sciopticon is the name of his new instrument, and from actual trial we find that it posseses many superior qualities. Its lenses are excellent, and in illu- minating power its light ranks next to the oxy-hydro- gen. The Sciopticon light is produced from ordinary coal oil, by an ingenious arrangement of double flames, intensifying the heat and resulting in a pencil of strong white light. Professor Marcy's instrument is the per- fection of convenience, simplicity, and safety. Any one may successfully work it, and produce the most brilliant pictures upon the screen. It is peculiarly adapted for school purposes and home entertainment. Those who wish to do a good thing for young people should provide one of these instruments. Photographic transparencies of remarkable places, persons, and objects, may now be purchased at small cost, while there is no end to the variety of pictures which may be drawn by hand at 7